Laying SFTP Twisted Pair for 1-Wire/RS485: Under Plaster or in Conduit?

Hello.
I'm not sure if this query is better suited to the construction department, but I found more similar issues in this department than there.

In a newly built apartment, I want to install a bus to the home automation network. The bus will be 1-wire or some serial (RS485 type). I'm going to put the SFTP twisted pair (each pair in a separate screen).

The general contractor wants some terrible money from me because of the need to make furrows in the concrete on the conduits. In addition, I'm afraid that later I may have trouble pulling the cable through these conduits (they may cut them somewhere or bend them too sharply ...)

Are there cables that can be laid just like electric cables, just under plaster and in the floor? I have the impression that even an ordinary twisted pair should withstand such treatment. How about a twisted pair instead of a wire?

Can you advise which solution to choose? If it were to be a gigabit network, I would not hesitate and throw the few thousand on the conduits. But here bandwidth hardly matters ...
Maybe someone has already successfully done similar experiments?

I myself put an ordinary cable "in the plaster" at home, I live for 3 years without problems. It would be safer in a conduit, but when you do, put a conduit with a cable in the wall, because the subsequent insertion (even if you put a conduit with a remote control) will be difficult.

You write "a few thousand for a conduit" - I don't know how much you need, but in my village, a thin tube costs 0.50 PLN / running meter

Thanks for the answer. That is, there are those who have successfully laid the twisted pair in this way ...

Kuniarz wrote:

You write "a few thousand for a conduit" - I don't know how much you need, but in my village, a thin tube costs 0.50 PLN / running meter

In Warsaw, it probably does not cost more, only the contractor charged me PLN 50 / running meter of the groove in the concrete. It came out PLN 2600. I would like to avoid this expense.

I would use an outdoor cable for this purpose, not an indoor one, if the cable is located outside the house inside the concrete (moisture, temperature difference).

Or even better, for about 1.50 a meter there is a twisted pair "to be buried" - under the hard cover there is a gel / wax and only the veins are embedded in it.

The conduit makes sense in a situation where something bad happens and you replace the cable, although you need to pull the cable through a perforated conduit ... the road through the torment! It is better to give smooth-walled pipes - a similar cost and convenience for the future is invaluable (even hydraulic pvc pipes can do it)! The one you write about is called gelled - the gel prevents the ingress of moisture and gives slippage like the twisted pair is to "swing" in the wind somewhere.

Thanks for the answer.
The designer approving the developer's installation scheme did not want to agree to lead the twisted pair to electrical boxes and lead "low voltage" cables (twisted pair) near the "high voltage" (electricians) without additional cover.
Ultimately, I proposed dedicated boxes for automation to which the twisted pair should be lead (next to some boxes with electrical equipment). After picking up the premises, it will be easy to change what you need and, for example, plaster the redundant cans. In addition, at the points of crossing with electric cables, the twisted pair is to go in a conduit. If it has to be led in the floor, it should also go in the hoses.